Operating jack for double-hooked needles in knitting machines



LMAZG A. M. MULLER OPERATING JACK FOR DOUBLE HOOKED NEEDLES IN KNITTING MACHINES Filed May 31, 1927 v :fatented Dec. 11, 1928.

unrreo sTAIns PATENT "OFFICE,

ADOLF MAX MfILLER, OF CHEMNITIZ, GERMANY;

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Application flled'llayfil; 1927, Serial No."195,481, and in Germany June 3, 1926.

This invention has reference to improve ments in the so-called jacks or sinkers 'em-.

posed needle cylinders are frequently employed into which the double-hooked needles are drawn by jacks or sliders of special construction and in accordance with the in- 3% tended kind of knitting of the meshes being effected either by plain working or purl working. These jacks should be constructed in such a manner as to be adapted to impart very accurate guiding to the double-hooked or double-tongue needles, that is to say this par.- ticular needle should have the least possible amount of play with relation to the jack, so that the double-hook or double-tongue needle will always be sure to be guided, so as to as- 9 sume the same, accurately determined position relatively to the tongue-opener, thereby making sure that the tongue opener will never be moved past the needles without opening the tongues thereof. With this end in view, I; it was the usual practice that the closing opening of the jack, slider or sinker, serving for the reception of the needle-hook was made as small as possible. With this construction it was indeed sure of being displaced by the jack almost without play from one needle-cylinder into the other needle-cylinder. There was however the danger of the jacks, on account of their comparatively small clos ing openings and owing to inaccurate guid- 5 ing, failing to become reliably engaged with absolute precision with the hooks of the double-tongue or double-hook needles, so that the hooks of the needles were likely to be frequently injured in the operation. On the other hand, the attempts made to obviate these difficulties by the employment of jacks with larger closing openings were objectionable, because in this case there was no absolute- 1y reliable uiding for the double-tongue needles, so t at the tongue-opener in view of the inaccurate positioning of the needle,

was freguentl moved past the needle, without opemng t e tongue thereof.

Now, my invention is intended to overcome'thesevarious objections and difficulties by prov ding an operating jack composed of two sectional parts, a so-called pushing jack and a so-called draft-jack and adapted to provlde a comparatively large closing openmg for-the jack upon its engagement with the double-hooked or double-tongue needle, means bemg provided for the gradual reduction of this closing opening during the movements of the hooked needle, until the hook of the double-tongue needleis at last retained with absolute precision and firmness in the reduced closing opening between the pushing jack and the draft jack, the needle being then guided into the particular working position without any play in regard to the jack or slider. l

With the above mentioned objects and ad.- vantages in view the invention relates to certain novel features of construction and operation, an embodiment of which is described by way of exemplification in the speci- 'fication and illustrated in the annexed drawing in which Figure l is a representation of the ack in accordance with my invention, and composed of two parts and in engagement with the hook of a double-tongue or dou- 'ble-hooked needle. Figure 2 shows the two -of the draft jack and one end of the pushing jack the smallest sized closing opening is formed in which the hook is retained with perfect safety.

The double-tongued or double-hooked- 10o needle 2 is adapted to be moved by the jacks into the lower or into the upper needle cylinder in accordance with the requirements of the particular manner of knitting under consideration. For this purpose the jacks are provided with a closing opening adapted for the reception of the needle hook. If this closing opening is made very small, so that it is only large enough to barely house the hook of the double-tongued needle, there is the difficulty that the needle hook on being engaged by the jack is likely to be injured in consequence of any possible inaccuracy in the position of the tongued needle with relation to the jack. v In order to eliminate this objection, the closing opening has been made of somewhat larger dimensions according to the previous art, with the disadvantage how: ever, of the play of the double-tongued needle with relation to the jack becoming too large and of the resulting unintentional frequent displacement of the double-tongued needle in the lower needle-cylinder to such an extent that the tongue-o ener was liable to move past the needles wit iont opening the tongues thereof. In order to obtain a faultless article, these drawbacks must be avoided by all means, and in view thereof the novel jack construction according to this invention provides for a bipartitejack for the movement of the double tongued needles or double-hooked needles, the said jack being composed of a so-called pushing Jack 6 and a so-called draft jack 5. Both of these complemental jacks are disposed, so as to be displaceable side by side of eachother in the bearings provided in the needle-cylinders, and-as shown for instance in Figures 3 and 4 of the drawing. The pushing jack 6 which is adapted to guide the donble-tongued needle into an intermediate position between the two needle cylinders, is provided with an aperture -8, adapted to be engaged by a projection Tprovided on the nlling jack 5. The projection 7 is preferab y forcibly; pushed into the draft jack 5 and the composite jack thus formed and composed of two relatively displaceable sectional parts is horizontally and vertically reciprocated in the usual manner by means of the triangular governing means provided in the so-called locking-ring or b any other suitable equivalent means, and in view of this the draft jack carries the foot 5. If the draft jack becomes hookingly engaged with the needle 2, the closing opening 4, 9 which is indicated in Figure 3 will be large enough to be sure of becoming engaged with and to receive the hook of the needle. Thereupon the draft jack 5 is displaced sufiiciently with relation to the push ing jack 6, until the stop 11 of the draft jack 5 strikes the stop 6 of the pushing jack, thus compelling the pushing jack to participate in the movement of the draft jack. In the meantime the closing opening which in Figure 4 has been indicated at 10, has become reduced to such an extent that the needle hook is perfectly retained, thereby causing. the needle itself to be reliably and accurately guided in its further movement. If now the needle is to be moved again into the'intermediate position between the two needle cylinders, the draft jack 5 would first be displaced with relation to the pushing jack 6, until the projection 7 of the draft jack 5 being engaged with the aperture 8 of the pushing jack 6 impinges againsttheupper edge of said aperture 8 of the pushing jack, the said pushing jack is compelled to participate in the rest of the movement, so as to become now adapted to push the tongued needle into the proper position, In the meantime however, the closing opening between the hook of the draft jack and one end of the pushing jack has become again enlarged sufficiently to release the hook of the double tongued needle with absolute reliability.

Having thus described my invention in its broad aspects and in a preferred exemplification thereof, it should, of course, be understood that it is susceptible of modifications and changes to suit existing conditions and the convenience of the operator and without thereby departing from the spirit and scope of the invention as defined in the appended claim.

I claim In a device of the kind described in combination, a draft jack and a pushing jack, slidingly longitudinally and displaceably engaging each other and conjointly constituting a two part operating jack, an apertured portion, and a projecting portion, respectively disposed on said jacks, and engageable with play with each other, and for axial relative displacement of the jacks, stopping and impinging means on the draft jack, spaced from the pushing jack, and engageable with said pushing jack after a certain movement of the draft jack, and coacting retaining means at the confronting extremities of the two complemental jacks, and adapted for the reception of a needle hook.

ADOLF MAX MULLER. 

